Rotary electric machine



Apr. 24, 1923. 1,453,166

, Y 1(.NCBUHARA ROTARY ELECTRIC MACHINE Filed Oct. 25, 1919 Patented f-ipre 2.4i, 1223.

1,@253, (iti UNITED STATES PATENT FFICE..

ROTARY ELECTRIC VIACENE.

Application filed october 23, 1919.

To all whom t may concern:

Be it known that KANTARO Nonuiiaici, citi- Zen of Japan, residing at No. 2055 liiiyanoH ushiro, llishinoiniya-cho, Mako-gun, ""iyogcl'en, dapan7 has i and lic. il

invented certain useful improvements in Rotary Electric Machines; and he does hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use 'the same.

This invention relates to an in'ipi'ovenient in the invention applied forin the United States Patent @dice Serial lo. 228,451. ln the said invention, the main parts of a rotary electric machine are immersed in a liquid in an air tight casing, and a gas is forced into the clearance between the cores of the rotor and the stator in order to keep the liquid from touching` the surface of the rotor and also to avoid frictional losses that may be incurred when the liquid touches the said surface. ln this improvement instead of forcing a gas under pressure into the clearance space, the gas in the clearance space is constantly being` exhausted or sucked out. This is a very useful modification of the former invention, because, by this means the machine parts may be constructed more simply.

The accompanying drawings show an induction motor according to this invention. Fi g. 1 is a sectional elevation of the machine its lower half on the rightv hand side being left uncut. Fig. 2 is a sectional end elevation its right hand half being left uncut.

1n the figures, 1 is the frame of the machine, 2 is an end cover iXed on both ends of the frame, forming an air-tight external easing of the machine in conjunction with the frame. 3 isa rotor shaft on whicha rotor core, 5, with hollow conductors, 6, is lined. The rotor sha-ft is made hollow at its left half; it is shown with dotted lines in Fig. 1. iis a stator core fixed inside of the external casing, a special duct piece or pieces, 4J, as in the former invent-ion, are inserted in the stator core.

To the end cover, 2, a bearing` holder, 7, is bolted, and the rot-or shaft rotates in the bearing metals, S. 9 is a cylindrical body xed between the stator core and the bear holder, and the rotor core is completely7 en- Serial No. 3352,69?.

closed by the stator core in conjunction with the said cylindrical bodies on both`A sides. 10 shows a stator coil or conductor.

in the topmost portion of the casing a chamber, 11, is provided, and the said chamber communicates with spaces 12 and 13 in the manner shown in Fig. 2. rlhe space 12 has an expansible chamber or oil level controller, 1-1, on its top, and the space 13 is the clearance between the external easing and the stator core.

t the left end of the rotor shaft, there are two pumps, 15 and 13, directly or indirectly coupled to the shaft. The pump 15 is a gas pump and the pump 15 is an oil pump. 16 and 1i' denote the delivery and the suction pipes of the former while 1G and 17 denote those of the latter respectively.

The chamber, 1S, is provided at the lowest place in the casing, from which chamber the suction pipe, 1.7, of the gas pump starts. rlhe said chamber also communicates with the exit or the bottom of the duet piece, -1, and the entrance or the top of the duct piece communicates with a pi 19, which stands in the topniost chamber 11. rihe delivery pipe of the gas pump opens at the upper part of the said chamber, and the delivery and the suction pipes of the oil pump open in the space 2O am` the space 13 respectively. the former beingthe space in the end cover of the left hand side. fr cooling water tube is provided in the space, 20, and a space 21, which is the space in the end cover of the right hand side. The letters 22 denote the coolingpipe in coil form, and its communieating pipe.

ik liquid, preferably oil, is deposited in the casing to such a heightthat the topmost chamber is half filled, the working,- parts of the machine being immersed in the liquid. fr gas, which is harmless to the said liquid is sealed in the space above the level of the liquid in the topmost chamber. Now, it can be easily understood that there are two different spaces in the machinethe dry or space and the wet or oil space. The lower half of the chamber 11, the spaces 12, 13, 20, 21, the pipes 16 and 17', are all wet spaces, while the higher part of the chamber 11, the pipes 16, 17, 19, the chamber 18, the duct piece or pieces f1 and the clearances over the rotor core are all dry ones.

the space Z the chamber 'll and the space lil in succession small quantity ot the oil returns 'from the space 2l to the oil pump by a branch passage which is shown with arroa's a, l), and c), While the pump sucks up the gas in the chamber through the pipe t9, the catiV duct piece et', the clearance o\c core, the mit oit tl e same duct piece., the chainl u' 'lf3 and the pipe 'li' successively, and l livers it ilinall f te the chamber fil. A small quantity oi; oil may leak from the Wet space into the dry space, but it can. be sucked out by the gas pump and is delivered to the ivf-,t space in the topmost chamber. The eil is cooled by the coolingr pipe, v22, `in its continuous circulatiffm, but the ,aas is cooled by the oil when it comes into contact with the latter in the topmost chamber. By this'means the heat generated in the cores and the conductors is consumed by the oil as Well as the gas.

According to this improvement the pipe arrangement of the machine is simplified, and the lloat in the lowest chamber, 18, and the saiety valve in the topmost chamber, may be dispensed with, although these members play important parts in the older invention.

l. A machine having rotary mechanism comprising a stationary part, a part movable relatiif'ely thereto and separated therefrom by a clearance space, means adapted and arranged to maintain a suitable fluid under pres/sure and in contact with said parts to cool the same, and means for creating` a suction in said clearance space between said parts.

2. A machine having rotary mechanism comprising the combination ot a stator member, a rotor member cooperating therewith and separated therefrom by a clearance space and means comprising substantially radial passages in one of said members for maintaining a partial vacuum in said clearance space.

3. A machine having rotary mechanism comprising a fluid-tight casing Within which the working parts are enclosed, said Werking parts being separated by a clearance space, means arranged to maintain a suitable fluid at a point above the Working parts, and means tor creating a suction in said clearance space between said parts.

4. A machine having rotary mechanism comprising` in combination, a stator and a rotor separated by a clearance, housing means therefor, a liquid pump for supplying coolingl liquid to said housing to cool said stator and rotor, and a gas pump connected to said clearance and maintaining a suction therein.

5. A machine having rotary mechanism comprising housing means within which the Working parts are enclosed, said working arts being sepan`r ltd by a clearance space, means arranged to maintain a suitable luid at a point above the working parts, packing means resisting entry of liquid into said clearance space and means for creating a suction in said clearance space between the parts.

6. A machine having rotary mechanism comprising a fluid-tight casingr within which the working parts are enclosed, said parts being; separated by a clearance space, means arranged to maintain a suitable fluid at a point above the Working parts, said casing being provided with an upper and a. lower chamber, said upper chamber providing a liquid space and a gas space. a stand-pipe in said upper chamber openin into said gas space and connected With sai lower chamber through said clearance space and fluid suction means creatingr a suction through said stand-pipe.

7. A machine having rotary mechanism comprising in combination a stator, and a rotor separated by a clearance, housing means therefor, means arranged to maintain a suitable tluid at a point above said stator and rotor.` means tor creating a suction in said clearance space and means for cooling said liquid.

8. A machine having rotary mechanism comprising a stator, a rotor separated therefrom by a. clearance space, means for circulating a liquid through said stator and rotor, means for creating a suction in said clearance space and means for cooling said liquid.

In testimony whereof he hereunto aflixes his signature in the presence ot two witnesses.

KANTARO NOBUHARA lllitnesses i O. Erni-mirino, A. JacoKUrr. 

